تحویل اکائیات

تحویلِ اکائیات اصل میں ایک ہی مقدار کیلئے مختلف پیمائشی اکائیوں کے جز و ضربی (factor) کی تبدیلی ہے.

مختلف اکائیوں میں کسی مقدار کی قیمت معلوم کرنے کیلئے تحویلِ اکائیات کا عمل استعمال کیا جاتا ہے.

تحویلِ جزوضربی کی جدولیں [ترمیم]

تنویر (Luminance) [ترمیم]

تنویر
اکائی کا نام	علامت	وضاحت	ایس.آئی اکائیوں سے تعلق
کینڈیلا فی مربع میٹر (ایس.آئی بنیادی اکائی)		≡ cd/m²	= 1 cd/m²
لیمبرٹ	L	≡ (10⁴/π) cd/m²	≈ 3183.09886 cd/m²

لمبائی [ترمیم]

لمبائی
اکائی کا نام	علامت	وضاحت	ایس.آئی اکائیوں سے تعلق
میٹر (ایس.آئی بنیادی اکائی)	m	≡ 1 m	= 1 m
اونگسٹرام	Å	= 0.1 nm	≡ 1 × 10⁻¹⁰ m
فلکیاتی اکائی	AU	زمین سے سورج کا اوسط فاصلہ	= 149 597 870 691 ± 30 m
بوہر, لمبائی کی جوہری اکائیاں	a₀	≡ آبگر کا بوہر رداس	≈ 5.29 177 208 59 × 10⁻¹¹ ± 3.6 × 10⁻²⁰ m^[1]
اُنگلی		≡ 7/8 in	= 0.022 225 m
اُنگلی (کپڑہ)		≡ 4 ½ in	= 0.1143 m
فٹ (بین الاقوامی)	ft	≡ 12 انچیں = 1/3 yd	= 0.3048 m
ہاتھ		≡ 4 in^[2]	= 0.1016 m
اِنچ	in	≡ 1/36 yd = 1/12 ft	= 0.0254 m
نوری-دن		≡ 24 نوری-ایّام	= 2.590 206 837 12 × 10¹³ m
نوری-گھنٹہ		≡ 60 نوری-منٹیں	= 1.079 252 848 8 × 10¹² m
نوری-منٹ		≡ 60 نوری-سیکنڈ	= 1.798 754 748 × 10¹⁰ m
نوری-سیکنڈ			≡ 2.997 924 58 × 10⁸ m
نوری-سال	l.y.		= 9.460 053 × 10¹⁵ m^[2]
مائیکرون	µ		≡ 1 × 10⁻⁶ m
میل	mi	≡ 5280 ft (US)	= 5280 × 1200/3937 m ≈ 1609.347 219 m

رقبہ [ترمیم]

رقبہ
اکائی کا نام	علامت	وضاحت	ایس.آئی اکائیوں سے تعلق
ایکڑ	ac	≡ 10 sq ch = 4840 sq yd	= 4046.856 422 4 m²
ہیکٹئیر	ha	≡ 10 000 m²	= 10 000 m²
مربع فٹ	sq ft	≡ 1 ft × 1 ft	= 9.290 304 × 10⁻² m²
مربع انچ	sq in	≡ 1 in × 1 in	= 6.4516 × 10⁻⁴ m²
مربع کلومیٹر	km²	≡ 1 km²	= 10⁶ m²
مربع میٹر (ایس.آئی اکائی)	m²	≡ 1 m × 1 m	= 1 m²
مربع میل; جُزء	sq mi	≡ 1 mi × 1 mi	= 2.589 988 110 336 × 10⁶ m²
مربع گز	sq yd	≡ 1 yd × 1 yd	= 0.836 127 36 m²

حجم [ترمیم]

حجم
اکائی کا نام	علامت	علامت	ایس.آئی اکائیوں سے تعلق
ایکڑ فٹ	ac ft	≡ 1 ac x 1 ft = 43560 ft³	= 1 233.481 837 547 52 m³
مکعب میٹر (ایس.آئی اکائی)	m³	≡ 1 m × 1 m × 1 m	= 1 m³
لیٹر	L	≡ 1 dm³ ^[3]	= 0.001 m³
لیمبڈا	λ	≡ 1 mm³	= 1 × 10⁻⁹ m³
قطرہ (اعشاری)		≡ 1/20 mL	= 50.0 × 10⁻⁹ m³
چائے کا چمچ (اعشاری)			≡ 5.0 × 10⁻⁶ m³
مکعب انچ	cu in	≡ 1 in × 1 in × 1 in	= 16.387 064 × 10⁻⁶ m³
پیالہ (اعشاری)	c		≡ 250.0 × 10⁻⁶ m³
مکعب فٹ	cu ft	≡ 1 ft × 1 ft × 1 ft	= 0.028 316 846 592 m³
بیرل (پٹرولیم)	bl; bbl	≡ 42 gal (US)	= 0.158 987 294 928 m³
پاؤ		≡ 8 bu (Imp)	= 0.290 949 76 m³
مکعب گز	cu yd	≡ 27 cu ft	= 0.764 554 857 984 m³
مکعب میل	cu mi	≡ 1 mi × 1 mi × 1 mi	= 4 168 181 825.440 579 584 m³

زاویہ [ترمیم]

زاویہ
اکائی کا نام	علامت	وضاحت	ایس.آئی اکائیوں سے تعلق
نصف قطر (ریڈین) (ایس.آئی اکائی)	rad	≡ 180°/π	≡ 1 rad
درجہ (قوس)	°	≡ π/180 rad	≈ 17.453 293 mrad
ربع دائرہ		≡ 90°	≈ 1.570 796 rad

کمیت [ترمیم]

نوٹ: کمیت/وزن میں فرق اور تبدیلی کیلئے وزن ملاحظہ کیجئے.

وقت [ترمیم]

وقت, t

کمیت
اکائی کا نام	علامت	وضاحت	ایس.آئی اکائیوں سے تعلق
کلوگرام,	kg; G		(ایس.آئی بنیادی اکائی)
برقیہ کل کمیت, کمیت کی جوہری اِکائی	m_e		≈ 9.109 382 15 × 10⁻³¹ ± 45 × 10⁻³⁹ kg^[4]
برقیہ وولٹ	eV	≡ 1 eV (تونائی اِکائی) / c²	= 1.782 6×10⁻³⁶ kg
متحدہ جوہری کمیتی اکائی	u; AMU		≈ 1.660 538 73 × 10⁻²⁷ ± 13 × 10⁻³⁵ kg
ڈالٹن	Da		≈ 1.660 902 10 × 10⁻²⁷ ± 13 × 10⁻³⁵ kg
گیما	γ		≡ 1 μg
اونس (avoirdupois)	oz av	≡ 1/16 lb	= 28.349 523 125 g
پاؤنڈ (اعشاری)			≡ 500 g

اکائی کا نام	علامت	وضاحت	ایس.آئی اکائیوں سے تعلق
ثانیہ (سیکنڈ)	s	time of 9192631770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 K (but other seconds are sometimes used in astronomy)	(SI base unit)
Planck time		≡ (G ℏ/c⁵)^½	≈ 1.351 211 818 × 10⁻⁴³ s
atomic unit of time	au	≡ a₀/(α·c)	≈ 2.418 884 254 × 10⁻¹⁷ s
svedberg	S	≡ 10⁻¹³ s	= 100 fs
shake		≡ 10⁻⁸ s	= 10 ns
sigma		≡ 10⁻⁶ s	= 1 μs
jiffy		≡ 1/60 s	≈ .016667 s
jiffy (alternate)		≡ 1/100 s	= 10 ms
helek		≡ 1/1080 h	≈ 3.333333 s
minute	min		≡ 60 s
milliday	md	≡ 86 400 s / 1000	≡ 86.4 s
moment		≡ 90 s	≡ 90 s
ke(traditional)		≡ 1/100 d	≡ 864 s
quarter (of an hour)	ke	≡ 1/96 d	≡ 900 s
hour	h	≡ 60 min	= 3600 s
day	d	≡ 24 h	= 86 400 s
week	wk	≡ 7 d	= 604 800 s
fortnight		≡ 2 wk	= 1 209 600 s
month (hollow)	mo	≡ 29 d	= 2 505 600 s
month	mo	≡ 30 d	= 2 592 000 s
month (full)	mo	≡ 31 d	= 2 678 400 s
year (Calendar)	a, y, or yr	≡ 365 d	= 31 536 000 s
year (Gregorian)	a, y, or yr	≡ 365.2425 d	= 31 556 952 s
year (Julian)	a, y, or yr	≡ 365.25 d	= 31 557 600 s
sidereal year	a, y, or yr	≡ time taken for Sun to return to the same position with respect to the stars of the celestial sphere = 365.256363 d	= 31 558 149.76 s
Olympiad		≡ 4 a of 365 d	= 1.2614 × 10⁸ s
lustre; lustrum		≡ 5 a of 365 d	= 1.5768 × 10⁸ s
octaeteris		≡ 8 a of 365 d	= 2.522 88 × 10⁸ s
decade		≡ 10 a of 365 d	= 3.1536 × 10⁸ s
enneadecaeteris; Metonic cycle		≡ 110 mo (hollow) + 125 mo (full) = 19 a of 365 d	= 5.996 16 × 10⁸ s
Callippic cycle		≡ 441 mo (hollow) + 499 mo (full) = 76 a of 365.25 d	= 2.398 377 6 × 10⁹ s
century (Calendar)		≡ 100 a of 365 d	= 3.1536 × 10⁹ s
century (Julian)		≡ 100 a of 365.25 d	= 3.155 76 × 10⁹ s
Hipparchic cycle		≡ 4 Callippic cycles - 1 d	= 9.593 424 × 10⁹ s
millennium (Calendar)		≡ 1000 a of 365 d	= 3.1536 × 10¹⁰ s
millennium (Gregorian)		≡ 1000 a of 365.2425 d	= 3.155 695 2 × 10¹⁰ s
millennium (Julian)		≡ 1000 a of 365.25 d	= 3.155 76 × 10¹⁰ s
Sothic cycle		≡ 1461 a of 365 d	= 4.607 409 6 × 10¹⁰ s

Speed or velocity [ترمیم]

Speed
Name of unit	Symbol	Definition	Relation to SI units
metre per second (SI unit)	m/s		≡ 1 m/s
foot per hour	fph	≡ 1 ft/h	≈ 8.466 667 × 10⁻⁵ m/s
furlong per fortnight		≡ furlong/fortnight	≈ 1.663 095 × 10⁻⁴ m/s
inch per minute	ipm	≡ 1 in/min	≈ 4.23 333 × 10⁻⁴ m/s
foot per minute	fpm	≡ 1 ft/min	= 5.08 × 10⁻³ m/s
inch per second	ips	≡ 1 in/s	= 2.54 × 10⁻² m/s
kilometre per hour	km/h	≡ 1 km/h	≈ 2.777 778 × 10⁻¹ m/s
foot per second	fps	≡ 1 ft/s	= 3.048 × 10⁻¹ m/s
mile per hour	mph	≡ 1 mi/h	= 0.447 04 m/s
knot	kn	≡ 1 NM/h = 1.852 km/h	≈ 0.514 444 m/s
knot (Admiralty)	kn	≡ 1 NM (Adm)/h = 1.853 184 km/h ^{[حوالہ درکار]}	≈ 0.514 773 m/s
mile per minute	mpm	≡ 1 mi/min	= 26.8224 m/s
mile per second	mps	≡ 1 mi/s = 1.609 344 km/s	= 1609.344 m/s
speed of light in vacuum	c	≡ 299 792 458 m/s	= 299 792 458 m/s
speed of sound in air	s		≈ 344 m/s at 20 °C, 60% relative humidity^[5]
mach	M	≡ 331 m/s ^{[حوالہ درکار]}	≈ 331 m/s

A velocity consists of a speed combined with a direction; the speed part of the velocity takes units of speed.

Acceleration [ترمیم]

Acceleration
Name of unit	Symbol	Definition	Relation to SI units
metre per second squared (SI unit)	m/s²	≡ 1 m/s²	= 1 m/s²
foot per hour per second	fph/s	≡ 1 ft/(h·s)	≈ 8.466 667 × 10⁻⁵ m/s²
inch per minute per second	ipm/s	≡ 1 in/(min·s)	≈ 4.233 333 × 10⁻⁴ m/s²
foot per minute per second	fpm/s	≡ 1 ft/(min·s)	= 5.08 × 10⁻³ m/s²
galileo	Gal	≡ 1 cm/s²	= 10⁻² m/s²
inch per second squared	ips²	≡ 1 in/s²	= 2.54 × 10⁻² m/s²
foot per second squared	fps²	≡ 1 ft/s²	= 3.048 × 10⁻¹ m/s²
mile per hour per second	mph/s	≡ 1 mi/(h·s)	= 4.4704 × 10⁻¹ m/s²
knot per second	kn/s	≡ 1 kn/s	≈ 5.144 444 × 10⁻¹ m/s²
standard gravity	g		≡ 9.806 65 m/s²
mile per minute per second	mpm/s	≡ 1 mi/(min·s)	= 26.8224 m/s²
mile per second squared	mps²	≡ 1 mi/s²	= 1.609 344 × 10³ m/s²

Force [ترمیم]

Force
Name of unit	Symbol	Definition	Relation to SI units
atomic unit of force		≡ m_e·α²·c²/a₀	≈ 8.238 722 06 × 10⁻⁸ N ^[6]
dyne (cgs unit)	dyn	≡ g·cm/s²	= 10⁻⁵ N
milligrave-force, gravet-force	mGf; gf	≡ g × 1 g	= 9.806 65 mN
kilogram-force; kilopond; grave-force	kgf; kp; Gf	≡ g × 1 kg	= 9.806 65 N
kip; kip-force	kip; kipf; klbf	≡ g × 1000 lb	= 4.448 221 615 260 5 × 10³ N
newton (SI unit)	N	≡ kg·m/s²	= 1 N
ounce-force	ozf	≡ g × 1 oz	= 0.278 013 850 953 781 2 N
pound-force	lbf	≡ g × 1 lb	= 4.448 221 615 260 5 N
poundal	pdl	≡ 1 lb·ft/s²	= 0.138 254 954 376 N
sthene (mts unit)	sn	≡ 1 t·m/s²	= 1 × 10³ N
ton-force	tnf	≡ g × 1 sh tn	= 8.896 443 230 521 × 10³ N

Pressure or mechanical stress [ترمیم]

Pressure
Name of unit	Symbol	Definition	Relation to SI units
atmosphere (standard)	atm		≡ 101 325 Pa ^[7]
atmosphere (technical)	at	≡ 1 kgf/cm²	= 9.80665 × 10⁴ Pa ^[7]
bar	bar		≡ 10⁵ Pa
barye (cgs unit)		≡ 1 dyn/cm²	= 0.1 Pa
centimetre of mercury	cmHg	≡ 13 595.1 kg/m³ × 1 cm × g	≈ 1.333 22 × 10³ Pa ^[7]
centimetre of water (4 °C)	cmH₂O	≈ 999.972 kg/m³ × 1 cm × g	≈ 98.0638 Pa ^[7]
foot of mercury (conventional)	ftHg	≡ 13 595.1 kg/m³ × 1 ft × g	≈ 40.636 66 × 10³ Pa ^[7]
foot of water (39.2 °F)	ftH₂O	≈ 999.972 kg/m³ × 1 ft × g	≈ 2.988 98 × 10³ Pa ^[7]
inch of mercury (conventional)	inHg	≡ 13 595.1 kg/m³ × 1 in × g	≈ 3.386 389 × 10³ Pa ^[7]
inch of water (39.2 °F)	inH₂O	≈ 999.972 kg/m³ × 1 in × g	≈ 249.082 Pa ^[7]
kilogram-force per square millimetre	kgf/mm²	≡ 1 kgf/mm²	= 9.806 65 × 10⁶ Pa ^[7]
kip per square inch	ksi	≡ 1 kipf/sq in	≈ 6.894757 × 10⁶ Pa ^[7]
micron (micrometre) of mercury	$\mu$ mHg	≡ 13 595.1 kg/m³ × 1 $\mu$ m × g ≈ 0.001 torr	≈ 0. 133 322 4 Pa ^[7]
millimetre of mercury	mmHg	≡ 13 595.1 kg/m³ × 1 mm × g ≈ 1 torr	≈ 133.322 4 Pa ^[7]
millimetre of water (3.98 °C)	mmH₂O	≈ 999.972 kg/m³ × 1 mm × g = 0.999972 kgf/m²	= 9.806 38 Pa
pascal (SI unit)	Pa	≡ N/m² = kg/(m·s²)	= 1 Pa ^[8]
pièze (mts unit)	pz	≡ 1000 kg/m·s²	= 1 × 10³ Pa = 1 kPa
pound per square foot	psf	≡ 1 lbf/ft²	≈ 47.880 25 Pa ^[7]
poundal per square foot	pdl/sq ft	≡ 1 pdl/sq ft	≈ 1.488 164 Pa ^[7]
pound per square inch	psi	≡ 1 lbf/in²	≈ 6.894 757 × 10³ Pa ^[7]
short ton per square foot		≡ 1 sh tn × g / 1 sq ft	≈ 95.760 518 × 10³ Pa
torr	torr	≡ 101 325/760 Pa	≈ 133.322 4 Pa ^[7]

Torque [ترمیم]

Torque
Name of unit	Symbol	Definition	Relation to SI units
Newton metre (SI unit)	N·m	≡ N × m = kg·m²/s²	= 1 N·m
foot-poundal	ft pdl	≡ 1 lb·ft²/s²	= 4.214 011 009 380 48 × 10⁻² N·m
inch-pound force	in lbf	≡ g × 1 lb × 1 in	= 0.112 984 829 027 616 7 N·m
foot-pound force	ft lbf	≡ g × 1 lb × 1 ft	= 1.355 817 948 331 400 4 N·m

Energy [ترمیم]

Energy
Name of unit	Symbol	Definition	Relation to SI units
joule (SI unit)	J	≡ m·N = W·s = V·A·s = kg·m²/s²	= 1 J
electronvolt	eV	≡ e × 1 V	≈ 1.602 176 × 10⁻¹⁹ J
rydberg	Ry	≡ R_∞·ℎ·c	≈ 2.179 872 × 10⁻¹⁸ J
hartree, atomic unit of energy	E_h	≡ m_e·α²·c² (= 2 Ry)	≈ 4.359 744 × 10⁻¹⁸ J
erg (cgs unit)	erg	≡ 1 g·cm²/s²	= 10⁻⁷ J
foot-poundal	ft pdl	≡ 1 lb·ft²/s²	= 4.214 011 009 380 48 × 10⁻² J
cubic centimetre of atmosphere; standard cubic centimetre	cc atm; scc	≡ 1 atm × 1 cm³	= 0.101 325 J
inch-pound force	in lbf	≡ g × 1 lb × 1 in	= 0.112 984 829 027 616 7 J
foot-pound force	ft lbf	≡ g × 1 lb × 1 ft	= 1.355 817 948 331 400 4 J
calorie (20 °C)	cal_20 °C		≈ 4.1819 J
calorie (thermochemical)	cal_th		≡ 4.184 J
calorie (15 °C)	cal_15 °C		≡ 4.1855 J
calorie (International Table)	cal_IT		≡ 4.1868 J
calorie (mean)	cal_mean		≈ 4.190 02 J
calorie (3.98 °C)	cal_3.98 °C		≈ 4.2045 J
kilocalorie; large calorie	kcal; Cal	≡ 1000 cal_IT	= 4.1868 × 10³ J
litre-atmosphere	l atm; sl	≡ 1 atm × 1 L	= 101.325 J
gallon-atmosphere (US)	US gal atm	≡ 1 atm × 1 gal (US)	= 383.556 849 013 8 J
gallon-atmosphere (imperial)	imp gal atm	≡ 1 atm × 1 gal (imp)	= 460.632 569 25 J
British thermal unit (thermochemical)	BTU_th		≈ 1.054 350 × 10³ J
British thermal unit (ISO)	BTU_ISO		≡ 1.0545 × 10³ J
British thermal unit (63 °F)	BTU_63 °F		≈ 1.0546 × 10³ J
British thermal unit (60 °F)	BTU_60 °F		≈ 1.054 68 × 10³ J
British thermal unit (59 °F)	BTU_59 °F		≡ 1.054 804 × 10³ J
British thermal unit (International Table)	BTU_IT		= 1.055 055 852 62 × 10³ J
British thermal unit (mean)	BTU_mean		≈ 1.055 87 × 10³ J
British thermal unit (39 °F)	BTU_39 °F		≈ 1.059 67 × 10³ J
Celsius heat unit (International Table)	CHU_IT	≡ 1 BTU_IT × 1 K/°R	= 1.899 100 534 716 × 10³ J
cubic foot of atmosphere; standard cubic foot	cu ft atm; scf	≡ 1 atm × 1 ft³	= 2.869 204 480 934 4 × 10³ J
cubic yard of atmosphere; standard cubic yard	cu yd atm; scy	≡ 1 atm × 1 yd³	= 77.468 520 985 228 8 × 10³ J
cubic foot of natural gas		≡ 1000 BTU_IT	= 1.055 055 852 62 × 10⁶ J
horsepower-hour	hp·h	≡ 1 hp × 1 h	= 2.684519537696172792 × 10⁶ J
kilowatt-hour; Board of Trade Unit	kW·h; B.O.T.U.	≡ 1 kW × 1 h	= 3.6 × 10⁶ J
thermie	th	≡ 1 Mcal_IT	= 4.1868 × 10⁶ J
therm (U.S.)		≡ 100 000 BTU_59 °F	= 105.4804 × 10⁶ J
therm (E.C.)		≡ 100 000 BTU_IT	= 105.505 585 262 × 10⁶ J
ton of TNT	tTNT	≡ 1 Gcal_th	= 4.184 × 10⁹ J
barrel of oil equivalent	bboe	≈ 5.8 ×10⁶ BTU_59 °F	≈ 6.12 × 10⁹ J
ton of coal equivalent	TCE	≡ 7 Gcal_th	= 29.3076 × 10⁹ J
ton of oil equivalent	TOE	≡ 10 Gcal_th	= 41.868 × 10⁹ J
quad		≡ 10¹⁵ BTU_IT	= 1.055 055 852 62 × 10¹⁸ J

Power [ترمیم]

Power
Name of unit	Symbol	Definition	Relation to SI units
watt (SI unit)	W	≡ J/s = N·m/s = kg·m²/s³	= 1 W
lusec	lusec	≡ 1 L·µmHg/s ^[9]	≈ 1.333 × 10⁻⁴ W
foot-pound-force per hour	ft lbf/h	≡ 1 ft lbf/h	≈ 3.766 161 × 10⁻⁴ W
atmosphere cubic centimetre per minute	atm ccm	≡ 1 atm × 1 cm³/min	= 1.688 75 × 10⁻³ W
foot-pound-force per minute	ft lbf/min	≡ 1 ft lbf/min	= 2.259 696 580 552 334 × 10⁻² W
atmosphere–cubic centimetre per second	atm ccs	≡ 1 atm × 1 cm³/s	= 0.101 325 W
BTU (International Table) per hour	BTU_IT/h	≡ 1 BTU_IT/h	≈ 0.293 071 W
atmosphere–cubic foot per hour	atm cfh	≡ 1 atm × 1 cu ft/h	= 0.797 001 244 704 W
foot-pound-force per second	ft lbf/s	≡ 1 ft lbf/s	= 1.355 817 948 331 400 4 W
litre-atmosphere per minute	L·atm/min	≡ 1 atm × 1 L/min	= 1.688 75 W
calorie (International Table) per second	cal_IT/s	≡ 1 cal_IT/s	= 4.1868 W
BTU (International Table) per minute	BTU_IT/min	≡ 1 BTU_IT/min	≈ 17.584 264 W
atmosphere-cubic foot per minute	atm·cfm	≡ 1 atm × 1 cu ft/min	= 47.820 074 682 24 W
square foot equivalent direct radiation	sq ft EDR	≡ 240 BTU_IT/h	≈ 70.337 057 W
litre-atmosphere per second	L·atm/s	≡ 1 atm × 1 L/s	= 101.325 W
horsepower (metric)	hp	≡ 75 m kgf/s	= 735.498 75 W
horsepower (European electrical)	hp	≡ 75 kp·m/s	= 736 W
horsepower (Imperial mechanical)	hp	≡ 550 ft lbf/s	= 745.699 871 582 270 22 W
horsepower (Imperial electrical)	hp		≡ 746 W
ton of air conditioning		≡ 1 t × 1005 J/kg × 1 °R/K ÷ 10 min	≈ 844.2 W
poncelet	p	≡ 100 m kgf/s	= 980.665 W
BTU (International Table) per second	BTU_IT/s	≡ 1 BTU_IT/s	= 1.055 055 852 62 × 10³ W
atmosphere-cubic foot per second	atm cfs	≡ 1 atm × 1 cu ft/s	= 2.869 204 480 934 4 × 10³ W
ton of refrigeration (IT)		≡ 1 BTU_IT × 1 sh tn/lb ÷ 10 min/s	≈ 3.516 853 × 10³ W
ton of refrigeration (Imperial)		≡ 1 BTU_IT × 1 lng tn/lb ÷ 10 min/s	≈ 3.938 875 × 10³ W
boiler horsepower	bhp	≈ 34.5 lb/h × 970.3 BTU_IT/lb	≈ 9.810 657 × 10³ W

Angular momentum [ترمیم]

Action, Angular momentum
Name of unit	Symbol	Definition	Relation to SI units
SI unit	J·s	≡ kg·m²/s	= 1 J·s
atomic unit of action	au	≡ ℏ = ℎ/2π	≈ 1.054 571 596 × 10⁻³⁴ J·s
cgs unit	erg·s		= 10⁻⁷ J·s

Capacitance [ترمیم]

Capacitor's Ability to Store Charge
Name of unit	Symbol	Definition	Relation to SI units
farad	F	amount of capacitance for which a potential difference of one volt results in a static charge of one coulomb	$=\mathrm \frac{A \cdot s}{V} = \dfrac{\mbox{C}}{\mbox{V}} = \dfrac{\mbox{C}^2}{\mbox{J}} = \dfrac{\mbox{C}^2}{\mbox{N} \cdot \mbox{m}} = \dfrac{\mbox{s}^2 \cdot \mbox{C}^2}{\mbox{m}^{2} \cdot \mbox{kg}} = \dfrac{\mbox{s}^4 \cdot \mbox{A}^2}{\mbox{m}^{2} \cdot \mbox{kg}}$

Electric current [ترمیم]

Electric current
Name of unit	Symbol	Definition	Relation to SI units
ampere (SI base unit)	A		1 A
esu per second; statampere (cgs unit)	esu/s	≡ (0.1 A·m/s) /c	≈ 3.335 641 × 10⁻¹⁰ A
electromagnetic unit; abampere (cgs unit)	abamp		≡ 10 A

Electric charge [ترمیم]

Electric charge
Name of unit	Symbol	Definition	Relation to SI units
coulomb (SI unit)	C	≡ A·s	= 1 C
atomic unit of charge	au	≡ e	≈ 1.602 176 462 × 10⁻¹⁹ C
statcoulomb; franklin; electrostatic unit (cgs unit)	statC; Fr; esu	≡ (0.1 A·m) /c	≈ 3.335 641 × 10⁻¹⁰ C
abcoulomb; electromagnetic unit (cgs unit)	abC; emu		≡ 10 C
faraday	F	≡ 1 mol × N_A·e	≈ 96,485.3383 C

Electromotive force [ترمیم]

Voltage, Electromotive force
Name of unit	Symbol	Definition	Relation to SI units
volt (SI unit)	V	≡ kg·m²/(A·s³)	= 1 V
abvolt (cgs unit)	abV		≡ 1 × 10⁻⁸ V
statvolt (cgs unit)	statV	≡ c· (1 μJ/A·m)	= 299.792 458 V

Electrical resistance [ترمیم]

Electrical resistance
Name of unit	Symbol	Definition	Relation to SI units
ohm (SI unit)	Ω	≡ V/A	= kg·m²/(A²·s³)

Inductance [ترمیم]

Inductance
Name of unit	Symbol	Definition	Relation to SI units
henry (SI unit)	H	≡ (m²×kg)/(s²×A²) = (V×s)/A = (J×s²)/C² = (m²×kg)/C²	= 1 H

Dynamic viscosity [ترمیم]

Dynamic viscosity
Name of unit	Symbol	Definition	Relation to SI units
pascal second (SI unit)	Pa·s	≡ N·s/m² , kg/(m·s)	= 1 Pa·s
poise (cgs unit)	P		≡ 10⁻¹ Pa·s

Kinematic viscosity [ترمیم]

Kinematic viscosity
Name of unit	Symbol	Definition	Relation to SI units
SI unit	m²/s	≡ m²/s	= 1 m²/s
stokes (cgs unit)	St		≡ 10⁻⁴ m²/s

Information entropy [ترمیم]

Information entropy
Name of unit	Symbol	Definition	Relation to SI units
SI unit	J/K	≡ J/K	= 1 J/K
nat; nip; nepit	nat	≡ k_B	= 1.3806505(23) × 10⁻²³ J/K
bit; shannon	bit; b; Sh	≡ ln(2) × k_B	= 9.569940(16) × 10⁻²⁴ J/K
ban; hartley	ban; Hart	≡ ln(10) × k_B	= 3.1790653(53) × 10⁻²³ J/K
nibble		≡ 4 bits	= 3.8279760(64) × 10⁻²³ J/K
byte	B	≡ 8 bits	= 7.655952(13) × 10⁻²³ J/K
kilobyte (decimal)	kB	≡ 1000 B	= 7.655952(13) × 10⁻²⁰ J/K
kilobyte (kibibyte)	KB; KiB	≡ 1024 B	= 7.839695(13) × 10⁻²⁰ J/K

Often, information entropy is measured in shannons, whereas the (discrete) storage space of digital devices is measured in bits. Thus, uncompressed redundant data occupy more than one bit of storage per shannon of information entropy. The multiples of a bit listed above are usually used with this meaning. Other times the bit is used as a measure of information entropy and is thus a synonym of shannon.

Temperature [ترمیم]

Note: see Temperature conversion for more detail

Temperature
Name of unit	Symbol	Relation to SI units
kelvin (SI base unit)	K	1 K
degree Celsius	°C	[K] = [°C] + 273.15
degree Rankine	°R; °Ra	[K] = [°R] × 5⁄9
degree Fahrenheit	°F	[K] = ([°F] + 459.67) × 5⁄9
degree Delisle	°De	[K] = 373.15 − [°De] × 2⁄3
degree Newton	°N	[K] = [°N] × 100⁄33 + 273.15
degree Réaumur	°Ré	[K] = [°Ré] × 5⁄4 + 273.15
degree Rømer	°Rø	[K] = ([°Rø] − 7.5) × 40⁄21 + 273.15

Radioactivity [ترمیم]

Radioactivity
Name of unit	Symbol	Definition	Relation to SI units
Becquerel (SI base unit)	Bq	≡ disintegration per second s^-1	= 1 Bq
Rutherford	rd	≡ 1 MBq	= 1 * 10⁶ Bq
curie	Ci	≡ 3.7 * 10¹⁰ Bq	= 3.7 * 10¹⁰ Bq^[10]

Radioactivity - absorbed dose [ترمیم]

Radioactivity - absorbed dose
Name of unit	Symbol	Definition	Relation to SI units
gray	Gy	≡ 1J/kg = 1m²·s^-2^[11]	= 1 Gy
rad	rad	≡ 0.01 Gy	= 0.01 Gy

Radioactivity - equivalent dose [ترمیم]

Radioactivity - equivalent dose
Name of unit	Symbol	Definition	Relation to SI units
Sievert (SI base unit)	Sv		= 1 Sv
Röntgen equivalent man	rem	≡ 0.01 Sv	= 0.01 Sv

حوالہ جات [ترمیم]

Klein, Herbert. 1988. The science of measurement: A historical survey. New York: Dover Publications.

مزید دیکھئے [ترمیم]

بیرونی روابط [ترمیم]

خطا در حوالہ: <ref> ٹیگس موجود ہیں، لیکن <references/> ٹیگ موجود نہیں

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